Smapi wont install

Aesth

Greenhorn
Hi, I have a problem with installing smapi.
I already played with mods a year ago and now my hyperfixation on Stardew returned. But now i dont get smapi started.
I already deleted the old version and the game when stopped playing last year.
I downloaded everything again but now i get this when i try installing the newest version of smapi:

Extracting install files...
Unhandled exception. System.UnauthorizedAccessException: Access to the path 'C:\Users\username\AppData\Local\Temp\SMAPI-installer-f79f215aa6d5464799fd9f00b7f76445' is denied.
at System.IO.FileSystem.CreateDirectory(String , Byte[] )
at System.IO.Directory.CreateDirectory(String )
at System.IO.Compression.ZipFileExtensions.ExtractRelativeToDirectory(ZipArchiveEntry , String , Boolean )
at System.IO.Compression.ZipFileExtensions.ExtractToDirectory(ZipArchive , String , Boolean )
at System.IO.Compression.ZipFile.ExtractToDirectory(String , String , Encoding , Boolean )
at System.IO.Compression.ZipFile.ExtractToDirectory(String , String )
at StardewModdingApi.Installer.Program.Main(String[] args) in E:\source\_Stardew\SMAPI\src\SMAPI.Installer\Program.cs:line 45

I aready tried to change permissions and other tips on the internet but nothing works. Can someone help me?
 
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